Preferences lifecycle
======================


Update
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To do, help welcome :)

Deletion
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If you remove preferences from your registry, corresponding data rows won't be deleted automatically.

In order to keep a clean database and delete obsolete rows, you can use the `checkpreferences` management command. This command will check all preferences in database, ensure they match a registered preference class and delete rows that do not match any registered preference.

.. warning::

    Run this command carefully, since it can lead to data loss.